Exhaust-steam injector



Jan. 16, IIQZB.

R. D. METCALFE ET AL. EXHAUST STI-:AM INJECTOR.

FILED MAY 24 I92I we J." Z3 .me maw/fas f@ QZ ma 4\ m m .I m W W W Patented dem l@ lgo untreu sra se f res retirar courtes',

RICHARD DAVID METCALFE, F ROMILEY, AND JAMES CROXON EEETCLFE, 0F

EIARPLE, ENGLAND.

EXHAUST-STEAM IINJ'ECTOR.

, appiicatin alta' may 24,

METCALFE,'0 The Mount, lRomiley,I Chesh'- ire, England, and JAMES CRoXoN METGALFE, of Sheen Bank, Marple, Cheshire, England,

both British subjects, have invented certain new and useful lmprovements in Exhaust-Steam Injectors, of which the following is a specification.

rlhis invention relates to exhaust steam injectors, that is the injectors which ldepend primarilyy upon a supply of exhaust steam at about atmospheric pressure but which can be worked by livesteam throttled l5r down to about atmospheric pressure, when exhaust steam is not available.

'llhe object oil our present invention is to provide improved means for supplyingthe throttled down live-steam when exhaust 2o steam is not available;I Ysuih means ensuring an even distribution of such steam at the inlet end of the steam ,inletnozzle of the injector.. A The invention comprises the improved combination and arrangement of parts here-Q inafter described and claimed..

Referring to the accompanyingv sheet oi" explanatory drawings which illustrate an exhaust injector havingour invention. apjY 3o iplied thereto Figure l is a sectional elevation and lFigure 2 a part sectional'plan-view.

The same reterenceletters in 'the two views indicate the same parts.

The injector compr'ses a delivery nozzle a, a combining nozzle with an opening and closing hinged ilap c thereon, a water cone d and a steam nozzle e. Exhaust steam is admitted 'to the injector past the valve )F 4o which is fitted with an extension spigot g adapted to enter the valvev seating ring it so as to ensure that the valvecloses correctly when engaged by the cam t.,

' 'll-he nozzle 7 provides a supply or live steam at full boiler pressure to assist the exhaust steam when the latter is unable to provide a sufficient delivery pressure to leed the-boiler to which the injector is' fitted.

, The valve j controls the 'the formation or' a vaeuum around 1921. serial no. tracas.

supply or steam to the nozzle j.' y A rlhe supply of live steam which is throttled downto about .atmospheric pressure by the valve It andwhich is utilized to operate the injector when exhaust steam is not available, is obtained from the -passage k having an outlet port at m and also an Iannular passage naround the steam nozzle y' for the discharge of the steam.` ln order,

however, to ensure a delivery of the steam from la into the steam space in advance ot the injector nozzles and in the direction ot the nozzle e and passage g supplying steam to the space between the nozzles cl and c, we provide the steam nozzle j with a pro'- jecting flange like ring o thereon and through the said ring are drilled or formed a number of ports or nozzle-like apertures p by which the steam is directed into the nozzle e. Steam also diiluses into the injector through the space betwpen the ring o and the tace Vof the steam supply passagejc and so ensures the supply or the passage g, the steam from the port m serves prevent 'inflow ot exhaust steam, a passage admittirig live steam throttled down to about at'vmospheric pressure, the live steam nozzle aoren said extending through said passage, an annular steam delivery passage around the said live steamnozzle for throttled down live steam, and a ring with ports therethrough through and around which` the l steam from said annular passage is directed into the exhaust steam nozzle, as set forth. 2,. ln'exhaust steam injectors, in combination, exhaust steam, llve steam, combining,

and 'delivery nozzles, a valve controlling the through upon the live steam nozzle inflow of exhaust steam, a passage admitting through and around Which the' steam l0 live steam throttled down to about atmosfrom said annular passagel isV directed pheric pressure, the live steam nozzle aforeinto the exhaust steam nozzle, as set forth.

-said extending through said passage, an In testimony whereof We have signed our v annular steam delivery passage around the names to this specification. A A said live steam nozzle for throttled down RICHARD DAVID METCALFE. livel steam, and a ringwth ports there- JAMES CROXON METCALFE. 

